mine against the gas they are hooked up to.
I have two manifold sets of the Ritchie Yellow Jacket gauges with 72" hoses and one set of direct couplers w/o hoses for ice machine work.
I've never had any gauges accurately calibrated like with a laboratory standard gauge. I often just check my suction gauge on the fly, like when a R22 compressor on a walk-in cycles off you watch where the gauge stops briefly at 58# (32 Deg) while any accumulated frost melts off the coil. That's accurate enough for me.
The high pressure gauge isn't as critical generally, but you can always check it by getting a pressure and temperature reading from a refrigerant tank that's been sitting in a stable temperature overnight, like at the shop.
If they are off a few psi who gives a crap anyway?
If your suction gauge is off by a couple of pounds you won't get an accurate superheat rea.......oh, never mind.
Yeah Ice, like I said, who gives a crap.
gauges lie also, thats why they have adjustment screws.
Originally posted by frozensolid
Transducers lie Thats why they have offsets.
Transducers are right more often than you think. I dont believe there always accurate, but they often are. lets face it, they take less abuse than most mechanics gauges. In the 8 years I have been doing supermarket work I have only found 2 faulty transducers and one that I had to put an offset into. Most of the transducers out there that fail or read wonky pressures are the ones that have been pulled into a vac, unless there designed for it never pull them into one.
want to know a secret?
My gauges have been knocked around and abused like most of us. The gauges have not have to be recalibrated once in 7 years! I use a richie manifold with a set of Marsh Gauges, I bought when Unitied use to sell them, they no longer handle them
I found a replacement set in a farmers supply house 20 miles north of me. I now have a set waiting for the original set to crap out
I swear by these suckers
Bob Key Largo
Replace mine twice a year. Used set for spare. Check valves one on set and not on others. 5' yellow jacket hoses and guages. They need to be on 0 when you start or add or subtract. Nice to have flutterless guages now so you don't have to kink the hose.
Be safe not fast. body parts don't grow back
No, not mad, possibly insane though.
...put my fluke heat clamp on a line next to a schrader fitting where may gage is attached and look at a P/T chart and check that against what my gage reads...my Fluke is pretty trustworthy
Originally posted by condenseddave
I beat the living hell out of essentially all of my tools. If they can't take it, they weren't worth having.
The Yellow Jacket gauges with the brass cases are rated for 1% accuracy, and I have a half-dozen sets of them.
I only use JB gauges and manifolds for two purposes:
- Double Low pressure
- Net oil pressure. (Double low sides on one manifold.) I carry 4 sets of these at all times.
- Suction core pressure drop.
- Double high pressure.
- Liquid line filter pressure drop.
- Holdback valve differential.
- Defrost differential valves.
- Any other high side app where I need to measure differential.
I carry around 2 dozen sets all the time.
STOP Dave .... your breaking my heart!!! You mean to tell me I need to buy a couple of DOZEN sets of gages???
I thought I was rich with having three sets around!
Now it appears in market circles .. I am but a pauper!
Go ahead DIce, take a deep breth .... say "anything" .....
Originally posted by Diceman
I'm not allowed to say anything.
There .... now wasnt that better?